Both apple music and Duolingo are basically just downloading sound files from the internet and playing them. One can do it all day and barely drop 10% battery.

Both apple music and Duolingo are basically just downloading sound files from the internet and playing them. One can do it all day and barely drop 10% battery. The other would drain your phone in an hour. OK Duolingo sometimes does some speech recognition but I bet that’s done server side and it’s downloading/uploading way less data than Apple Music.